الفهرس 
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Abstract
Faba bean, Vicia faba L. and Egyptian clover, Trifolium alexandrinum L. are important legume crops all over the world. This study was carried out from2019 up to 2023 season on Egyptian clover and faba bean fields of Kafr El- Sheikh and Gharbia governorates. The aims of this study were to survey insect pests and their associated insect predators, true spiders, parasitoids and calculate the correlation coefficient values between the major pests and their natural enemies. Evaluating the efficiencies of sampling methods in collecting arthropods. Twenty one insect pest species related to five orders and 12 families were collected from clover, while those of faba bean were 21 insect pest species. The most common insect pests in clover were Hypera brunnipennis, Empoasca spp. while those of faba bean were Aphis craccivora, Empoasca spp, Liriomyza congesta and Tropinota squalida. The spiders were found belonging to eight families in clover fields. Seventeen species were collected from faba bean belonging to six orders and 13 families and nine spider species belonging to seven families. The most dominat predators in both crops were Coccinella undecimpunctata, chrysoperla carnea, Scymnus sp, syrphids and four families of spiders; Linyphiidae, Philodromidae, Salticidae and Lycosidae. The most dominant parasitoids were Opius sp., Cotesia ruficrus, Bathyplectes curculionis and Microctonus sp from clover field but Aphidius sp, Opius sp. and Cotesia sp from faba bean fields. Pitfall traps proved to be the most efficient tool for collecting domestic cricket, ground beetles, ants and lycosids while window traps were distinguished in collecting the flying insects. Sweep net and D-vac proved to be the most efficient tools for collecting most of insect predators, parasitoids and spiders. Microctonus sp. emerged from H. brunnipennis adults while Bathyplectes curculionis emerged from the host larvae. Highly significant positive correlations were found between the number of H. brunnipennis larvae and each of chrysoperla carnea larvae as well as spider complex. Larvae of cotton leafworm, Spodoptera littoralis (Boisd) were collected from clover field, and Cotesia ruficrus emerged from larvae .in both seasons. Field experiment was conducted to evaluate the efficiency of two biocides and insecticide against Aphis craccivora on faba bean plants. Average reductions in aphid population throughout the experimental period were 78.22% for Applaud (IGR, Buprofezin), 70.28% and 63.14% for Biosect (based on Beauveria bassiana) and Biotect based on (Bacillus thuringiensis), respectively.